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TECHNICAL MANUAL  

CVM 2 

C 5001 CV/04-99 GB

 

  

5

 

1.2 

Pressure probes 

There are two 4-20mA , 0-30 bar pressure probes for all the units, except for the water-water heat pumps with reversing cycle 

on the water side. 

 

TERMINALS 

MEANING 

7, 8 

1

st

 circuit condensing pressure 

9, 10 

2

nd

 circuit condensing pressure 

 

Pressure [Bar] 

0.0 

0.5 

1.0 

1.5 

2.0 

2.5 

3.0 

3.5 

Current [mA] 

4.00 

4.27 

4.54 

4.80 

5.07 

5.34 

5.61 

5.87 

 

Pressure [Bar] 

4.0 

4.5 

5.0 

5.5 

6.0 

6.5 

7.0 

7.5 

Current [mA] 

6.14 

6.41 

6.68 

6.94 

7.21 

7.48 

7.75 

8.01 

 

Pressure [Bar] 

8.0 

8.5 

9.0 

9.5 

10.0 

10.5 

11.0 

11.5 

Current [mA] 

8.28 

8.55 

8.82 

9.08 

9.35 

9.62 

9.89 

10.15 

 

Pressure [Bar] 

12.0 

12.5 

13.0 

13.5 

14.0 

14.5 

15.0 

15.5 

Current [mA] 

11.43 

10.69 

10.96 

11.23 

11.49 

11.76 

12.03 

12.30 

 

Pressure [Bar] 

16.0 

16.5 

17.0 

17.5 

18.0 

18.5 

19.0 

19.5 

Current [mA] 

12.56 

12.83 

13.10 

13.37 

13.63 

13.90 

14.17 

14.44 

 

Pressure [Bar] 

20.0 

20.5 

21.0 

21.5 

22.0 

22.5 

23.0 

23.5 

Current [mA] 

14.70 

14.97 

15.24 

15.51 

15.77 

16.04 

16.31 

16.58 

 

Pressure [Bar] 

24.0 

24.5 

25.0 

25.5 

26.0 

26.5 

27.0 

27.5 

Current [mA] 

16.84 

17.11 

17.38 

17.65 

17.92 

18.18 

18.45 

18.72 

 

Pressure transducer verification procedure: 

• 

switch off the compressors and leave the unit with only the “ON/OFF switch” button ON; 

• 

disconnect the cable from terminal 7 or 9 of microprocessor, depending on the probe; 

• 

place digital milliammeter between the disconnected terminal and the cable and read the current value; 

• 

read the pressure value using a gauge placed near the transducer; 

• 

compare the readings with the values shown in the table. 

 

 

Summary of Contents for CVM 2

Page 1: ...UPPLY 8 2 SETUP 8 2 1 ACCESS TO PROGRAMMING 8 3 SOFTWARE 9 3 1 DESCRIPTION OF USER INTERFACE 9 3 2 UNIT STARTUP 9 3 3 UNIT SHUTDOWN 10 3 4 ALARMS 10 3 4 1 Circuit and or compressor alarms 10 3 4 2 Gen...

Page 2: ...ated inside the electrical panel and of a keyboard Enclosures fig 1 The boards for the continuous adjustment of the fan speed are connected to the main board The keyboard communicates with the main bo...

Page 3: ...HNICAL MANUAL CVM 2 C 5001 CV 04 99 GB 3 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 Figure 1 1 MAIN BO...

Page 4: ...r temperature Temperature C 55 50 40 30 20 Resistance 485 510 562 617 677 Temperature C 10 0 10 20 25 Resistance 740 807 877 951 990 Temperature C 30 40 50 60 70 Resistance 1029 1111 1196 1286 1378 Te...

Page 5: ...0 15 5 Current mA 11 43 10 69 10 96 11 23 11 49 11 76 12 03 12 30 Pressure Bar 16 0 16 5 17 0 17 5 18 0 18 5 19 0 19 5 Current mA 12 56 12 83 13 10 13 37 13 63 13 90 14 17 14 44 Pressure Bar 20 0 20 5...

Page 6: ...Circuit 1 compressor thermal protection 14 AT6 Circuit 2 compressor thermal protection 19 AT7 Circuit 1 fans thermal protection 13 AT8 Circuit 2 fans thermal protection 20 AT9 Water differential press...

Page 7: ...1 1 KEYBOARD CONNECTION 1 7 Remote keyboard Figure 1 2 REMOTE KEYBOARD CONNECTION NB The supplementary transformer is the 230 12 Vac transformer supplied with the remote keyboard kit The maximum leng...

Page 8: ...gh the parameter list using the arrow up and arrow down keys to visualise the required parameter Press the SET key the value of the parameter on the left hand side of the display will start flashing M...

Page 9: ...and stand by condition required by the timer Then they become steady indicating operational readiness first of COMPRESSOR 1 and then of COMPRESSOR 2 If the unit is a HEAT PUMP the HEATING LED comes o...

Page 10: ...ssor alarms are visualised with the corresponding flashing code on the DISPLAY while the ALARM LED comes on The related compressor is simultaneously shut down Alarm reset Press the ON OFF RESET key th...

Page 11: ...l protection Manual Possible compressor motor malfunction E04 Circuit 1 fan thermal protection Manual Possible electric fan motor malfunction E05 Circuit 1 antifreeze Manual Check the water flow rate...

Page 12: ...to the evaporator Check the operation of the water pump Verify if cold set point is correct parameters 2 58 59 E26 ST3 probe malfunction Automatic Check the connections to board terminals 5 and 6 Pro...

Page 13: ...urs Operating hours since last operating hours reset 03 Circuit 1 fans 01 operating 02 off for defrosting 06 fans off 04 Circuit 1 defrosting not present 01 defrosting 02 compressor 1 safety count 03...

Page 14: ...resent value in C 10 ERR probe error 44 Condensing water inlet temperature reading for unit with reversing cycle on water side ST5 or condensing pressure reading for unit with fans speed regulation SP...

Page 15: ...et point 12 C 4 Chiller differential 1 C 48 t 2 C NB regulation is made based on the temperature reading at the evaporator inlet 6 2 Hot water regulation To modify the working set point of the unit in...

Page 16: ...hiller 1 Water water chiller 3 Water air heat pump 5 Water water heat pump with reversing cycle on liquid side Table 7 1 UNIT TYPE 2 M COLD SET POINT COOLING p 58 p 59 120 C 10 3 M WARM SET POINT HEAT...

Page 17: ...11 M CIRCUIT No 2 FAN OPERATING MODE 0 MODULATING OUTPUT 1 ON OFF 2 DISABLED 0 num 12 M MODULATING OUTPUT LOWER LIMIT 0 100 30 13 M MODULATING OUTPUT UPPER LIMIT 0 100 100 14 M SUMMER CUT OFF SET POIN...

Page 18: ...23 M MAXIMUM DEFROST TIME 0 126 5 min 24 M DELAY BETWEEN FIRST CIRCUIT END OF DEFROST AND SECOND CIRCUIT START DEFROST 0 126 2 min 25 M FORCED VENTILATION PRESSURE DURING DEFROST 0 30 16 Bar CHILLER...

Page 19: ...SOR START DELAY AFTER PUMP START 0 126 60 sec 41 M PUMP SHUTDOWN DELAY AFTER COMPRESSOR SHUTDOWN 0 126 60 sec 42 M DIFFERENTIAL PRESSURE SWITCH AND EXTERNAL FLOW SWITCH ALARM BY PASS E41 UPON PUMP STA...

Page 20: ...2 CIRCUIT CONFIGURATION 58 M SUMMER SET POINT LOWER LIMIT CHILLER 20 p 2 10 C 59 M SUMMER SET POINT UPPER LIMIT CHILLER p 2 50 20 C 60 M WINTER SET POINT LOWER LIMIT HEAT PUMP 10 p 3 30 C 61 M WINTER...

Page 21: ...P5 PROBE OFFSET 100 100 Bar 10 83 M SP6 PROBE OFFSET 100 100 Bar 10 84 CI DEFROST CYCLES 0 NOT ENABLED 1 ENABLED 1 flag 85 CI ANTIFREEZE HEATER 0 ABSENT 1 PRESENT flag 86 CI OPERATION OF ANTIFREEZE HE...

Page 22: ...0 E p 68 2 2 PRESENT ONLY FOR ON OFF Table 7 5 REMOTE CONTROL CONFIGURATION WARNING If the unit is switched off using the keyboard s ON OFF key the antifreeze resistance control will also go off This...

Page 23: ...TECHNICAL MANUAL CVM 2 C 5001 CV 04 99 GB 23 8 Enclosures...

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